Matrix ETERNITY NE System Manual 361
To resolve this, ETERNITY NE provides a configurable Pre-PSTN Digit Count (PPDC) for each CO trunk.
The PPDC defines the number of digits to be dialed by the extensions to reach the CO. The system applies Toll
Control check on extensions only after checking the PPDC configured for the CO.
On trunks that are connected to another PBX, in this case, T4, T5, and T6, PPDC must be configured with the
same number of digits as the Trunk Access Codes assigned for PBX-A. For example, if the Trunk Access Code is
a single digit number '0', the PPDC on must be configured as '1'. If the Trunk Access Code is a two-digit number,
61, the PPDC should be configured as '2'.
On trunks directly connected to the CO, i.e. T1, T2, T3 of ETERNITY NE, the PPDC must be configured as ‘0’.
To take the above example further, when PPDC is configured as ‘1’ on T4, T5 and T6, when the user of Extension
21 dials ‘0’ followed by another ‘0’ to grab T1 or T2 trunk of PBX-A, the system will check the PPDC configured on
the trunk. On finding ‘1’ the system will ignore the first 0 dialed by the extension, and let the extension user grab T1
or T2 by considering the second ‘0’. The Extension user will get the CO dial tone from T1 or T2 of PBX-A.
How to configure
The PPDC should be configured only for 'Behind the PBX Applications'. For all normal applications, this
count must be set to '0' for all the trunks. Otherwise, external number dialing may be hampered. Features
like Least Cost Routing and Station Message Detail Recording will also be affected.
For CO Trunks that are directly connected to the CO, PPDC must be configured as ‘0’.
For CO Trunks that are connected to the extensions of another PBX, PPDC must be configured as per the number
of digits in the Trunk Access Codes defined for the second PBX.
To configure, PPDC on a CO Trunk port,
• Log in as System Engineer.
• Click Basic Settings link.
• Click CO Trunks link.
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